package com.jy.reggie.controller;

import com.jy.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")
    private String bathPath;



    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){ //注意这里的变量名（file）要和前端的一致
        log.info("上传文件："+file.getOriginalFilename());
        //1.获取原始文件名
        String originalFilename = file.getOriginalFilename();
        //2.使用UUID重命名，防止文件重名覆盖
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        String filename = UUID.randomUUID().toString()+suffix;
        //3.判断保存的文件目录是否存在，不存在就创建
        File dir = new File(bathPath);
        if(!dir.exists()){
            dir.mkdirs();
        }
        //4.保存图片到指定位置
        try {
            file.transferTo(new File(bathPath+filename));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(filename);
    }


    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        try {
            //        1. 输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(bathPath + name));
            //        2. 输出流，通过输出流将文件写回浏览器，在浏览器展示图片
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes= new byte[1024];
            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            //        3. 关闭流
            outputStream.close();
            fileInputStream.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}
